Electric bell



J. "E. THRO-N. ELECTRIG .BELL.

(No Model.)

Patented 001;. 1a, 1892.

W ITNESS ES;

UNITED STATES PATENT OFFICE.

JOHN E. THRON, OF PHILADELPHIA, PENNSYLVANIA.

ELECTRIC BELL.

SPECIFICATION forming part of Letters Patent No. 484,762, dated October 18, 1892.

Application filed June 18, 1892- Serial No. 437,177- (No model.)

To all whom it may concern.-

Be it known that I, JOHN E. THRON, a citizen of the United States, and a resident of the city and county of Philadelphia, and State of Pennsylvania, have invented an Improvement in Electric Bells or Gongs, of which the following is a specification.

My invention has reference to electricbells or gongs; and it consists of certain improvements which are fully set forth in the following specification, and shown in the accompanying drawings, which form a part thereof.

The object of my invention is to provide a simple construction adapted to electric bells or gongs of preferably large size whereby high-striking speed may be maintained with a slower speed of armature movement.

In carrying out my invention I combine the armature of the electro-magnets With a secondary lever carrying the striker or hammer upon a flexible arm, spring actuated in one direction and drawn away in the other direction under the action of a trip-pawl controlled by the moving armature. By this construction the action of the hammer or striker is quick and produces a sharp, clear, ringing sound from the bell.

The details of construction are fully set out hereinafter.

In the drawings, Figure 1 is an elevation of an improved electric bell. Fig. 2 is a perspective view of the striking mechanism, and Fig. 3 justable stop and trip.

A is the main frame of the bell and is formed of metal and of any shape desired. To this frame is secured the bell B, preferably at the upper portion thereof.

0 are the electro-magnets of usual constructionthat is to say, preferably horseshoe in shape-and are secured to the fraine A near its lower part.

D is the armature, and is pivoted to the main frame at d, and is adapted to be moved in one direction by a spring E, the tension of which may be adjusted by a screw 6.

F is a back-stop designed to limit the distance the armature moves away from the electro-magnets.

G is a springcontact carried by the main frame and is adjustable by means of a screw 9. The electric circuit enters the bindingis a perspective view of the ad post H from the line, passes through the spring-contact G, thence to the armature D, and by connection 0 with the electro-magnet O, and finally to the other binding-post I. It will now be evident that the armature D will be caused to vibrate rapidly if the external circuit is closed, for when the armature is in the position shown the circuit is closed through the electro-Inagnets O, and is interrupted whenthe armature is attracted toward the electro-magnets, permitting the spring 8 to return the armature to its original position and to repeat this operation indefinitely.

J is a pivoted arm arranged above the armature D and pivoted atj to the main frame A. The free end of this arm is provided with a flexible arm k, carrying upon its extreme end a hammer K, which is adapted to strike the bell B. The lever-arm J is pulled upward or away from the armature by means of a spring P, the tension of which may be adjusted by a screw 19, and the upward movement of the said lever-arm J is limited by the adjustable stop L. The armature D and the lever-arm J are slotted, as at Q, and in the'slot of the armature D is pivoted the upwardlyextending trip N, which projects through the slot Q in the lever-arm J, and is provided with a shouldern and a cam-face n. The shoulder n is adapted to catch over the edge of the slot Q, so that when the pawl N is drawn down by the armature it pulls the armature J with it. As it descends the camface' at moves in contact with the adjustable screw M, causing the pawl N to be drawn backward against the action of a spring 0 of the armature, so as to liberate the leverarm J during the downward motion of the armature and pawl, so as to permit thearm J. to be pulled up rapidly against its stop L and cause the hammer K to strike the bell B.

It will be observed that all of the parts are nicely adjustable, so that the apparatus may set to work accurately and control the relative time of movement of the various parts. The armature may move through a different are than the arm J and may have a difierent velocity, as the parts are relatively independent except during portion of the downward movement of both. It will be seen that the hammer K may return and strike the bell during the downward motion of the armature D and permit theiarmtJ to bein thelpropecposition upon the upward movement of the pawl N, so as to be again caught upon the return downward movement of the said armature. By this construction the hammer does not retard the vibration of .thelanmature;iandcperei mits the bell to be operated rapidly, and also with a strong striking blow, withoutprodup: ing undue vibration of the parts-controlling to the electrical circuit. The back vibration'of the hammer has no effect whatever upon the movementsof the armature, andconseqn'ently" does not interfere with:the-rcontactstthereofr* By passing the pawl N up through a slot in I 5 the arm J it isfirmly held impositionagain st i v accidental displacement, and aht'hesametime; rwtransmits its-iforcad-irectly m-theniidnle of. a 1 the said arm insuringbetter wear ofrthe pants, a andflless binding-arpon the armature; lfiyipiiv-h zo'oting the said 'pawl N 'acentralliy withurespect w to the-armature D the Stlifilihl llPGl'liflElGtPiVOti d 1:- fiamaintaiued uniform andigreatendurability;

isrinsured to these parts. r lithe bell isdesi-gned to beirpngiintermite. 2 5: tentl-y or asastrikinggong inaplace of ya vi l bratingbelhit is ronly necessary to ,adjustthe springslG-and-Eso as to never ,breakithetcone ,Wttact with the armature D or tonsjmply cone. 1 'necttthebinding-face H withtthehmainaframe. 3o orrterm-inal of-.the:ielectro-magnets at c, as ine e dicatedin dotted-lines. x Underthiscondiition twtheiarmaturellwill beidrawlndown npo'ntthe' r -oclosing of the extennalcircu itandwill: remain down until therexternal circuitisbrokenr Bye .lthis emeans-.-the downward movement ofmthei maum'atureeinsures anpositivez striking of the t --l-b6ll by the hammer irrespective of. v theitime w ofneturn of-ithe 'armature. j

i i lhe'details oficonstrnctiomnlay beanodified-t oawithontgdcparting fromctthesprinci-pl es of my" m invention.

a: 1: Having now-described, myiinvention whatl i ll claim as new, and desire toi'secnre byLetters aPatent; is- 1 1-. In: an :electric tbellgthevcombination of= A =thermai n-iframe the bell,- ant-electrormagnem I. an-armatureoperated biyt-theselectrosmagnet; vacircuitdnterrnpten controlled by itheiarma- 1: 4311161 for interruptingzthe circuitthrougm the gc electroemagnet; a pivotediarm havjngia harm-1' women-flexibly connected-thereto at itsfreeend i aspring to move-the arm away fromethe armlmatureyastop tozli-mit the/movement of the ,t fiammertowardx the bell, a ,tri p. ibetween l. the, 5 5 armature a and pivot-armtvvlsxer'eley-the lmoveel ement of" the armaturewowardi the electro- 1: magnet moves thepivot-armif-rom t-heibell, at mspring toapress thezpi-vot-arm intolocking pom sition; and :a cam; devicebetweenrtheipivota 6o anmwand; nmainv frame forwoperatingu the: trip 1-; device to cause it to release. the pivoted iarm: tinand hammer-from the action otthearmature 1n=and-:permit-it to be drawn towardtthe hell by m the spring.

itlremain frame, a bell, aneIeGtrQ-magnet, an 'armature operated by "the *electro magnet, binding-posts upon the main frame, an electric circuit extending between the bindingposts and including the electro-magnet, a piv- :.;oted ar'm having a hammerflexibly connected thereto at its free end, a spring to move the ,arm away from the armature, a stop to limit *themnovement of the hammer toward thebell, a trip between the armature and pivot-arm whereby the movement of the armature toward the *electro magnet moves thepivot-arm rawayhfromathesbel'l, a spring to press the piv- -ot-arm into locking position, and a cam device between the-pivot-arm and-main, frame 'for operatinglthe trippingl device tolcause it togrelease. the pivotearmrand. hammer from .thetaction othe1armature and. permit it to bedrawnitowardthefbll byetherspring.

. 3-.1 In aneelectricfibellytheicombinatiori of the main frame',.aibell, an electro-magnet; an armature .operalted, by the, electro. emagnet,

.bindingepostsuponthamainiframe, anelectric circuit,iextendingnbetween the binding- -posts.andincluding thleeleotnmmagnet;.alpivotfarmi hayinglahamme'r .flexjblylconnected -thereto at.itsefireetend aspring to move the .armvayvay from,the armature astop torlimit .the movement ofthe ham mertowardthe bell, t a trip :betweem the i armature. .andrpivotearm wherebyithemovement. oi :the :anmatnre tozward the electrmmagnetmovesthvpiwot-arm awayr-fromtthe helhalspring to. press-.the piv- ,ot-armtintelockingsposition, a cam device bettweentthe pivot-arm andamain rfraniefor opteratingthenripping device toicauser it to retleasettheipivot-arm andrhammerifromtthe action 'o'ftthe armature-andpermititm beidrawn towardthelbell, byethelspringandmeans to ,adj ust theltime ofaction ofiisaidacanridevice for the purpose lit-liberatingetheahammer at dirfiferentetimes .relatiyely tom the: movement of the armature toward the-velectrommagnet.

at. In amelectric be1l,tthe.coinbination of a emaimframe, an electro=magneticarried thereby, anarmaturepivotedtheretoandloperated byethe lelectroirn agnehabell, azpivotrarnx carrying a hammer upo'ns itstend torstrikel the =bell,wmeans tonmove-theflhammer toward the Abel],- a stop to limit the'moyement of, thehamivmGI tOWaI d the iboll, ,e pivoted. pawl; carried by the armatureand extending uprthrough a ,slot imthe pivoted .arm ari'dt having its end iprovidedwith a canr-facatatlspring to epress ,theupawl into lock-jug wpositiontwithtthepivotarm, and an adjustable-pantioveriwhich the p cam lIIJQVBS' for the purpose of con trolling the .action of i the -pivoted,trip :to relieasethepivo t- .armtcarnyingtthehhammer.

Inwtestimon'y. of which invention It have hereunto: set my hand.

V J. E.: THAR'ON.

Witnesses:

w .JoHN L, -RICKE1TS,

6 5. 2; In aucelectric bell,--the-comihination of .ERNEST, -HOWARD. HUNTER. 

